feat: expand scheduling, notifications, and queue runtime

- add scheduled task plumbing across backend core, CLI, and frontend surfaces

- add frontend notification UI and keep service pages using the repaired shared stylesheet

- refactor code queue runtime and update baidu netdisk/service integration docs

scripts/src/e2e.ts

@@ -301,6 +301,7 @@ const LAYOUT_OVERFLOW_PAGE_TEST_IDS: Record<string, string> = {
   "/nodes/gateway/": "gateway-version-page",
   "/tasks/pending/": "pending-task-page",
   "/tasks/history/": "task-history-page",
+  "/tasks/scheduled/": "scheduled-task-page",
   "/app/catalog/": "microservice-catalog-page",
   "/app/todo-note/": "todo-note-page",
   "/app/findjob/": "findjob-page",